{ "data": { "a": { "slug": "databento", "name": "Databento", "vendor": "Databento, Inc.", "vendorUrl": "https://databento.com", "kind": "http-api", "category": "market-data", "summary": "Databento is a market data platform with historical and live tick, order book and bar data for US and European equities, futures, options and indices, through HTTP and streaming APIs with Python, C++ and Rust clients.", "url": "https://www.anchorterminal.com/tools/databento", "markdownUrl": "https://www.anchorterminal.com/tools/databento.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/databento.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/databento.json", "dns": "databento.grade.anchorterminal.com", "repo": "https://github.com/databento/databento-python", "license": "Apache-2.0 (clients)", "transports": [ "http" ], "remoteUrl": "https://hist.databento.com", "packages": [ { "registry": "pypi", "name": "databento" } ], "auth": "api-key", "authNotes": "API key (32 characters starting `db-`) created in the portal, up to 100 per account with unique names, rotated or deleted from the portal, and sent as the username in HTTP Basic auth (`-u $KEY:`). Team members can be given per-member permissions. The vendor revokes keys it finds published. No query-string option.", "pricing": "usage", "pricingNotes": "Historical data is metered per GB of uncompressed binary data at rates per dataset in the portal catalogue, with no subscription; batch jobs are billed once and streams per byte sent. New users get $125 of credits valid six months, one set per team, for historical data or the first month of a plan. Live data needs a plan, Standard at $199 a month (no licence fees), Plus $1,750 and Unlimited $4,500 a month in licence fees on annual contracts by sales. Metadata, symbology and account calls are free.", "priceSummary": "$199 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the docs, llms.txt, pricing page or release notes (checked 2026-11-03).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 309, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-11-03" }, "docsUrl": "https://databento.com/docs/", "llmsTxt": "https://databento.com/docs/llms.txt", "capabilities": [ "market.prices", "market.history", "market.indices", "data.markets" ], "tags": [ "official", "hosted", "usage", "usage-priced", "free-tier", "llms-txt", "status-page", "pre-1.0", "python", "rust", "closed-source" ], "lastRelease": "2026-10-28", "graded": true, "anchor": { "graded": true, "score": 60.3, "grade": "C", "agentReady": false, "rank": 578, "ranked": true, "rankOf": 1349, "categoryRank": 4, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 80, "maintenance": 84, "payments": 22, "reliability": 50, "schema": 75, "security": 61, "transparency": 49 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-03" }, "negative": 0, "verdict": "Exchange-level tick and order book data metered per GB, with published per-IP rate limits, Retry-After on 429, dated release notes and clients in three languages. The HTTP API is still at major version 0, the status page lists two critical and several major incidents in 90 days, there is no OpenAPI document, and the legal pages were unreadable.", "bestFor": "An agent that needs exchange-level trades, quotes, order book and bar data for US and European futures, options and equities, or corporate actions and a security master, and can budget per GB.", "strengths": [ "Per-IP rate limits published with numbers, 429 with Retry-After, and a documented error format with a code, a message and a docs link", "`metadata.get_cost` quotes a request before it is billed, batch jobs are billed once with 30 days of re-download, and a monthly historical spending limit can be set in the portal", "Dated release notes per component with breaking changes and deprecations called out, and Python 0.85.0 to 0.89.0 released between 25 August and 28 October 2026", "Up to 100 named API keys per account with rotation, per-member permissions, and keys found in public revoked by the vendor", "$125 of credits at signup and metered historical pricing with no subscription; metadata and symbology calls are free" ], "weaknesses": [ "Two critical and several major incidents on the status page in the 90 days to 3 November 2026, mostly Historical API outages and batch job delays", "The HTTP API is at major version 0 and the docs say it is not considered stable", "No OpenAPI document; per-GB rates sit in the portal catalogue behind a login, and the pricing page shows plans only", "The terms and privacy policy are drawn by script and could not be read, and no security.txt, SOC 2 or ISO 27001 was found", "Live data and the Plus and Unlimited plans need a subscription on an annual contract by sales, and signup is in a browser" ], "agentNotes": [ "Call `metadata.get_cost` before `timeseries.get_range`, and set a monthly historical limit in the portal; a duplicate streaming request is charged twice", "Send the key as the Basic auth username (`-u $DATABENTO_API_KEY:`) to hist.databento.com/v0; never put it in the URL or source code", "On 429 wait for the Retry-After header; keep under 100 time series requests a second and 20 batch submissions a minute per IP", "Check status.databento.com before retrying a slow or 504 Historical request, since several incidents since August were API outages or batch delays", "Use batch download for requests over 5 GB, split by time range or `limit`, and read `schema` and `stype_in` from the dataset page before querying" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 60.3 } ], "editorialScores": { "ergonomics": 80, "maintenance": 84, "payments": 22, "reliability": 50, "schema": 75, "security": 61, "transparency": 28 }, "provenanceScore": 70, "checked": { "categories": { "ergonomics": "2026-11-03", "maintenance": "2026-11-03", "payments": "2026-11-03", "reliability": "2026-11-03", "schema": "2026-11-03", "security": "2026-11-03", "transparency": "2026-11-03" }, "last": "2026-11-03", "oldest": "2026-11-03", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "pip install databento", "http": "curl -G 'https://hist.databento.com/v0/metadata.list_datasets' -u $DATABENTO_API_KEY:" }, "letme": { "capability": "https://letme.dev/market.prices", "tool": "https://letme.dev/databento" }, "area": "domain-data", "unitPrices": [ { "item": "Standard plan", "unit": "month", "usd": 199, "note": "live data, no licence fees, monthly" }, { "item": "Plus plan licence fees", "unit": "month", "usd": 1750, "note": "annual contract, by sales" }, { "item": "Unlimited plan licence fees", "unit": "month", "usd": 4500, "note": "annual contract, by sales" } ], "provenance": { "legalEntity": "Databento, Inc.", "domain": "databento.com", "domainRegistered": "", "endpointOnVendorDomain": true, "terms": "https://databento.com/legal/terms", "privacy": "https://databento.com/legal/privacy", "statusPage": "https://status.databento.com", "changelog": "https://databento.com/docs/release-notes", "securityTxt": "none", "checked": "2026-11-03", "notes": [ "Databento, Inc. is named in the about page footer and as the GitHub organisation's name. The legal pages at databento.com/legal, /legal/terms and /legal/privacy answer 200 with a script shell and no text, so the terms, privacy policy, legal entity details and any automated-access clause are unread.", "databento.com/robots.txt disallows only /portal for all crawlers. status.databento.com and roadmap.databento.com allow reading.", "RDAP for databento.com was refused (403 from rdap.org), so the registration date is unchecked.", "/.well-known/security.txt returns 404.", "The status page is an Atlassian Statuspage at status.databento.com with Portal, Historical, FTP and seven live-feed components." ], "score": 70 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/databento.json", "live": { "slug": "databento", "probe": { "target": "https://hist.databento.com", "method": "get", "lastAt": "2026-11-04T19:34:31.331915623Z", "lastOk": true, "lastStatus": 200, "lastMs": 1514, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 344, "p95ms24h": 1514, "samples24h": 43, "samples30d": 43, "days": [ { "date": "2026-11-04", "probes": 43, "ok": 43 } ] }, "vendorStatus": { "page": "https://status.databento.com", "indicator": "minor", "summary": "Minor Service Outage", "checkedAt": "2026-11-04T19:31:26.086234819Z" }, "securityTxt": { "url": "https://databento.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-04T15:54:13.184390241Z" }, "updatedAt": "2026-11-04T19:34:31.331915623Z" } }, "answer": "Massive (formerly Polygon.io) scores 73.1 (BB) on agent readiness against Databento's 60.3 (C), and leads in 4 of 7 scored categories. Databento leads on security \u0026 auth.", "b": { "slug": "massive", "name": "Massive (formerly Polygon.io)", "vendor": "Massive", "vendorUrl": "https://massive.com", "kind": "http-api", "category": "market-data", "summary": "US market data API for stocks, options, indices, forex, crypto and futures, from the consolidated tapes.", "url": "https://www.anchorterminal.com/tools/massive", "markdownUrl": "https://www.anchorterminal.com/tools/massive.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/massive.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/massive.json", "dns": "massive.grade.anchorterminal.com", "repo": "https://github.com/massive-com/client-python", "license": "MIT (clients)", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.massive.com", "packages": [], "auth": "api-key", "authNotes": "`?apiKey=` or Bearer. x402 payments at agent.massive.com need no key.", "pricing": "freemium", "pricingNotes": "Free Basic plan at 5 calls a minute with 2 years of end-of-day data. Stocks Starter $29, Developer $79 and Advanced $199 a month for individuals (non-commercial), business plans priced separately (https://massive.com/pricing). Over x402 at agent.massive.com, 24 US stock routes at $0.01 a request in USDC on Base, with the live price in each 402 response (https://agentic.market/services/agent-massive-com).", "priceSummary": "$0.01 / call", "where": "hosted", "x402": { "level": "yes", "evidence": "x402 on agent.massive.com since 2026-09-01 per the changelog. The docs say each route quotes its live price in the 402 response and only successful requests are charged. Agentic.Market lists 24 GET routes at $0.01 each on Base, US stocks only, covering aggregates, snapshots, indicators, reference data, news and SEC filings (https://massive.com/docs/ai-tools/x402).", "endpoints": [ { "url": "https://agent.massive.com/v2/aggs/ticker/{stocksTicker}/range/{multiplier}/{timespan}/{from}/{to}", "priceUsd": 0.01, "network": "eip155:8453" }, { "url": "https://agent.massive.com/v2/snapshot/locale/us/markets/stocks/tickers/{stocksTicker}", "priceUsd": 0.01, "network": "eip155:8453" }, { "url": "https://agent.massive.com/v3/reference/tickers", "priceUsd": 0.01, "network": "eip155:8453" }, { "url": "https://agent.massive.com/v2/reference/news", "priceUsd": 0.01, "network": "eip155:8453" }, { "url": "https://agent.massive.com/stocks/filings/vX/index", "priceUsd": 0.01, "network": "eip155:8453" } ] }, "toolCount": null, "popularity": { "githubStars": 1500, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-26" }, "docsUrl": "https://massive.com/docs", "llmsTxt": "https://massive.com/llms.txt", "openapi": "https://api.massive.com/openapi", "capabilities": [ "market.prices", "market.history", "data.markets", "market.crypto", "market.indices" ], "tags": [ "official", "hosted", "x402", "freemium", "openapi", "llms-txt", "mcp" ], "lastRelease": "2026-10-28", "graded": true, "anchor": { "graded": true, "score": 73.1, "grade": "BB", "agentReady": true, "rank": 100, "ranked": true, "rankOf": 1349, "categoryRank": 1, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 78, "maintenance": 82, "payments": 90, "reliability": 78, "schema": 89, "security": 35, "transparency": 67 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-01" }, "negative": 0, "verdict": "24 US stock routes over x402 at agent.massive.com, $0.01 each on Base, and only successful requests are charged. The status history lists 14 partial incidents in the 90 days to 1 November, including US equity aggregate bars missing for about 16 hours on 8 and 9 September.", "bestFor": "Agents that need US equities, options or futures data with real history, and the only listing here selling US stock data over x402.", "strengths": [ "24 US stock routes over x402 at agent.massive.com, $0.01 each on Base, and only successful requests are charged", "OpenAPI document with enums and error responses, plus an llms.txt indexing about 160 endpoint pages", "Official clients in Python, JavaScript, Go and the JVM, regenerated from the OpenAPI spec as recently as 27 October 2026", "Incidents posted with start and end times on a Statuspage history feed", "Six dated changelog entries between 25 August and 28 October 2026" ], "weaknesses": [ "14 partial incidents from 3 August to 1 November 2026, mostly stale or missing data on stock aggregates and quotes", "x402 covers US stocks only, with no ticks, streaming or other asset classes", "The API key is accepted as `?apiKey=` in the query string, the only scheme the OpenAPI file declares", "No security.txt, bug bounty or certification found, and the privacy policy dates from March 2024", "Individual plans are non-commercial and business terms forbid redistribution" ], "agentNotes": [ "Send the key as a Bearer header, not `?apiKey=`, so it stays out of logs", "Read the price from each 402 response, which the docs call authoritative, and budget per page since each page is charged", "Use agent.massive.com only for US stocks. Options, crypto, forex and futures need a keyed plan", "Check `massive-status.com` when aggregates look stale, since several incidents since August were bars that stopped updating or went missing", "Don't republish prices fetched on an individual plan" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "BB", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 73.1 } ], "editorialScores": { "ergonomics": 78, "maintenance": 82, "payments": 90, "reliability": 78, "schema": 89, "security": 35, "transparency": 45 }, "provenanceScore": 88, "dataQualityScore": 87, "checked": { "categories": { "ergonomics": "2026-11-01", "maintenance": "2026-11-01", "payments": "2026-11-01", "reliability": "2026-11-01", "schema": "2026-11-01", "security": "2026-11-01", "transparency": "2026-11-01" }, "last": "2026-11-01", "lastMoved": "2026-11-01", "oldest": "2026-11-01", "stale": false, "staleAfterDays": 90 } }, "connect": { "http": "curl -H \"Authorization: Bearer $MASSIVE_API_KEY\" \"https://api.massive.com/v2/aggs/ticker/AAPL/prev\"", "claudeCode": "claude mcp add --transport http massive https://mcp.massive.com/" }, "letme": { "capability": "https://letme.dev/market.prices", "tool": "https://letme.dev/massive" }, "area": "domain-data", "unitPrices": [ { "item": "Stocks Starter", "unit": "month", "usd": 29, "note": "individual, non-commercial" }, { "item": "Stocks Developer", "unit": "month", "usd": 79, "note": "individual, non-commercial" }, { "item": "Stocks Advanced", "unit": "month", "usd": 199, "note": "individual, non-commercial" } ], "provenance": { "legalEntity": "Massive.com, Inc.", "domain": "massive.com", "domainRegistered": "1995-02-13", "domainNote": "massive.com was registered in 1995, decades before the rename.", "endpointOnVendorDomain": true, "terms": "https://massive.com/legal/businesses-terms-of-service", "privacy": "https://massive.com/legal/privacy", "statusPage": "https://massive-status.com", "changelog": "https://massive.com/changelog", "securityTxt": "none", "checked": "2026-11-01", "score": 88 }, "dataQuality": { "coverage": "All 19 US stock exchanges plus dark pools, and options, indices, forex, crypto and futures", "coverageRating": 5, "freshness": "Real time, 15-minute delayed or end of day by plan", "freshnessClass": "realtime", "history": "2 to 20+ years by plan", "historyYears": 20, "methodology": "https://massive.com/docs/rest/stocks/overview", "sourcesDisclosed": true, "licence": "Proprietary, with published terms for individuals and businesses", "licenceClass": "clear", "standing": "", "standingClass": "none", "reuse": "Business terms forbid redistributing, sublicensing or selling the data, and require deletion on termination. Individual plans are non-commercial.", "score": 87, "checks": null }, "pageJsonUrl": "https://www.anchorterminal.com/tools/massive.json", "live": { "slug": "massive", "probe": { "target": "https://api.massive.com", "method": "get", "lastAt": "2026-11-04T19:34:53.381369549Z", "lastOk": true, "lastStatus": 404, "lastMs": 307, "authRequired": false, "uptime24h": 100, "uptime30d": 99.98, "p50ms24h": 267, "p95ms24h": 358, "samples24h": 247, "samples30d": 8069, "days": [ { "date": "2026-10-04", "probes": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 247, "ok": 247 }, { "date": "2026-10-11", "probes": 247, "ok": 247 }, { "date": "2026-10-12", "probes": 247, "ok": 247 }, { "date": "2026-10-13", "probes": 248, "ok": 248 }, { "date": "2026-10-14", "probes": 249, "ok": 248 }, { "date": "2026-10-15", "probes": 253, "ok": 253 }, { "date": "2026-10-16", "probes": 252, "ok": 252 }, { "date": "2026-10-17", "probes": 253, "ok": 253 }, { "date": "2026-10-18", "probes": 256, "ok": 256 }, { "date": "2026-10-19", "probes": 255, "ok": 255 }, { "date": "2026-10-20", "probes": 252, "ok": 252 }, { "date": "2026-10-21", "probes": 253, "ok": 253 }, { "date": "2026-10-22", "probes": 253, "ok": 253 }, { "date": "2026-10-23", "probes": 248, "ok": 248 }, { "date": "2026-10-24", "probes": 251, "ok": 251 }, { "date": "2026-10-25", "probes": 250, "ok": 250 }, { "date": "2026-10-26", "probes": 252, "ok": 252 }, { "date": "2026-10-27", "probes": 249, "ok": 249 }, { "date": "2026-10-28", "probes": 251, "ok": 251 }, { "date": "2026-10-29", "probes": 248, "ok": 248 }, { "date": "2026-10-30", "probes": 249, "ok": 248 }, { "date": "2026-10-31", "probes": 251, "ok": 251 }, { "date": "2026-11-01", "probes": 249, "ok": 249 }, { "date": "2026-11-02", "probes": 250, "ok": 250 }, { "date": "2026-11-03", "probes": 248, "ok": 248 }, { "date": "2026-11-04", "probes": 202, "ok": 202 } ] }, "vendorStatus": { "page": "https://massive-status.com", "indicator": "minor", "summary": "Partially Degraded Service", "checkedAt": "2026-11-04T19:31:43.686632907Z" }, "versions": [ { "registry": "github", "name": "massive-com/client-python", "version": "v2.9.1", "released": "2026-10-26", "seenAt": "2026-11-03T20:38:07.628511208Z" } ], "githubStars": 1523, "securityTxt": { "url": "https://massive.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-04T15:52:42.899942093Z" }, "llmsTxt": { "url": "https://massive.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-04T15:23:22.551811497Z" }, "domain": { "domain": "massive.com", "registered": "1995-02-13", "source": "https://rdap.verisign.com/com/v1/domain/massive.com", "checkedAt": "2026-11-01T14:07:32.013168238Z" }, "pages": [ { "url": "https://massive.com/changelog", "kind": "deprecations", "status": 200, "checkedAt": "2026-11-04T08:27:39.330534708Z", "changedAt": "2026-10-31T06:16:01.564939681Z", "fingerprint": "0cd6bc9476ca" }, { "url": "https://massive.com/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-11-04T08:27:45.659813839Z", "changedAt": "2026-10-31T06:16:08.173405264Z", "fingerprint": "c06a4148bf72" }, { "url": "https://massive.com/legal/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-11-04T08:27:43.705812993Z", "changedAt": "2026-10-31T06:16:05.957773097Z", "fingerprint": "1c9024302c92" }, { "url": "https://massive.com/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-01T13:14:17.398766419Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "469364c15f7e" }, { "url": "https://massive.com/legal/businesses-terms-of-service", "kind": "terms", "status": 200, "checkedAt": "2026-11-04T08:27:41.718942017Z", "changedAt": "2026-10-31T06:16:03.806023028Z", "fingerprint": "f4ec38dadfe4" } ], "github": { "repo": "massive-com/client-python", "checkedAt": "2026-11-02T09:03:56.959547185Z", "stars": 1523, "archived": false, "issuesEnabled": true, "pushedAt": "2026-10-26T16:33:41Z", "openIssues": 13, "openPRs": 8, "issuesOpened90d": 4, "issuesClosed90d": 3, "prsMerged90d": 14, "ci": { "branch": "master", "runs": 50, "success": 48, "failure": 2, "other": 0, "latest": "success", "latestAt": "2026-10-26T04:23:15Z" }, "replies": { "sampled": 25, "unanswered": 7, "medianDays": 1.1 } }, "updatedAt": "2026-11-04T19:34:53.381369549Z" } }, "edges": [ { "by": 68, "category": "payments", "leads": "massive", "name": "Payments \u0026 pricing", "reasons": { "a": "No x402, MPP or L402 (0). Plans are public ($199, $1,750 and $4,500 a month) and historical data is metered per GB, but the per-dataset rates are in the portal catalogue behind a login and the pricing page's estimator shows only an example (12 of 20). $125 of credits for every new user, expiring after six months; whether a card is needed at signup was not found on the pricing, credits or billing pages (10 of 20). A person signs up in a browser and creates keys in the portal; no key API (0). Total 22.", "b": "x402 on its own domain at agent.massive.com since 1 September, but only 23 US stock routes. Options, indices, forex, crypto, futures, tick data and streaming still need a key (30 of 40). $0.01 a route on Agentic.Market, which the docs link to, and plan prices on massive.com/pricing, all without a login (20). Free Basic plan at 5 calls a minute with end-of-day data. The pricing page doesn't say a card is needed (20). An agent with a funded Base wallet can pay with no account (20)." }, "scores": { "a": 22, "b": 90 } }, { "by": 28, "category": "reliability", "leads": "massive", "name": "Reliability", "reasons": { "a": "Graded as a hosted service. Atlassian Statuspage at status.databento.com with ten components, Portal, Historical, FTP and seven live feeds (20). The incident feed for the 90 days to 3 November 2026 lists a critical outage of the portal and Historical API on 6 August lasting about eight hours, critical live authentication timeouts in NY4 on 28 August for about seven hours, major batch job delays of about two days each opened on 6 and 12 October, a six-hour GLBX.MDP3 delay in the Historical API on 6 October, and a Frankfurt outage affecting XEUR and XEEE opened on 2 November and still in monitoring. Several majors (0 of 30). Per-IP limits are published with numbers (15). 429 with a Retry-After header and a code to sleep on it; streams cut off aren't billed for unsent data, batch jobs are billed once (15). No SLA found; the pricing page names none and the terms were unreadable (0). The HTTP API is at major version 0 and the docs say it is not considered stable (0 of 10). Total 50.", "b": "Atlassian Statuspage at massive-status.com with REST, WebSocket and flat-file components for each asset class (20). The history feed lists 14 unplanned incidents from 3 August to 1 November 2026, each limited to one product, one endpoint, one asset class or some accounts. They include US equity aggregate bars missing for roughly two-thirds of US equities from 18:46 ET on 8 September until 10:29 the next day, stale stocks quotes on 20 August, and slow responses with intermittent 502s on stocks v2 aggregates from 10:37 to 13:08 ET on 2 September. The newest, on 27 October, was delayed WebSocket data and REST errors for some accounts from 13:49 to 14:17 EDT. Read the way partial incidents are read on other listings, that is minor incidents only (20). Free plan limited to 5 calls a minute, paid plans unlimited, nothing stated for x402 (10 of 15). No 429 or Retry-After guidance found in the docs or the OpenAPI file, though the official Python client retries 429 with backoff (8 of 15). The business terms dated 6 October 2026 point to a separate Support Policy and SLA document for customers who buy service levels (10). The REST API is generally available (10)." }, "scores": { "a": 50, "b": 78 } }, { "by": 26, "category": "security", "leads": "databento", "name": "Security \u0026 auth", "reasons": { "a": "Named API keys, up to 100 per account, rotated or deleted in the portal, with per-member permissions, sent only as the Basic auth username; no scopes per key and no expiry (25 of 30). Every API call is a read, and a monthly historical limit caps what a leaked key can spend; live usage is not capped (14 of 20). The API returns market data and reference records, not free text from third parties (10). A data usage page in the portal and a billing page per cycle, with no per-key call log documented (8 of 15). The vendor revokes keys it finds in public and documents key hygiene; security.txt returns 404 and no bounty, SOC 2 or ISO 27001 was found on readable pages (4 of 20). Total 61.", "b": "A plain account key with no scopes, sent as a Bearer header or as `?apiKey=` in the query string, a documented option (20 less 10, so 10). The x402 route at agent.massive.com needs no key. Read-only market data with no write actions (15 of 20). The x402 set includes news and SEC filing text written by third parties, and we found no guidance on treating it as untrusted (5 of 15). Paid x402 calls leave an on-chain USDC transfer. We found no request log documented for keyed callers (5 of 15). security.txt returns 404, and the terms and privacy policy name no SOC 2, ISO 27001, bug bounty or disclosure policy, only safeguards 'consistent with general industry standards' (0 of 20)." }, "scores": { "a": 61, "b": 35 } }, { "by": 18, "category": "transparency", "leads": "massive", "name": "Transparency \u0026 trust", "reasons": { "a": "A closed service whose terms could not be read, because databento.com/legal and its /terms and /privacy pages are drawn by script; the client libraries are Apache-2.0 (10 of 30). The privacy policy was unread for the same reason, and the docs say nothing about retention of account data (0 of 30, unchecked). Dated release notes carry deprecations, and the versioning policy keeps a prior major version for a year after the next (18 of 20). No subprocessor list or data location statement was found on readable pages; the architecture docs name the company's own data centres (0 of 20). Total 28.", "b": "Closed service under business terms last updated 6 October 2026, Massive.com, Inc. under Georgia law, which now also cover pay-per-request purchases without an account. The MCP server and clients are MIT (15). Privacy policy last updated 22 March 2024, with retention 'as long as we are providing the Services' and no periods. The business terms require deleting data on termination. No DPA found (12 of 30). Dated sunsets in the changelog. The terms let Massive change the Services at its discretion, with a 30-day route to report a change that materially degrades a subscribed service (10 of 20). Stripe, Google and Hotjar are named, and data may sit 'in the United States and locations around the world'. No subprocessor list (8 of 20)." }, "scores": { "a": 49, "b": 67 } }, { "by": 14, "category": "schema", "leads": "massive", "name": "Schema \u0026 documentation", "reasons": { "a": "No OpenAPI document was found. The contract is the per-endpoint reference with typed parameters, the DBN schemas with field tables and enums, and a .http.md variant of every page (8 of 25). llms.txt and a Markdown twin of every page with language variants (10). Endpoint pages say what each call returns and the basics pages say when to use streaming against batch (15 of 20). Typed parameters with enums for schema, encoding, symbology type and split duration (13 of 15). Code in Python, C++, Rust and curl on every page, and an error table with codes, named error identifiers and a docs link in each body (14 of 15). Semantic versioning with dated release notes per component, breaking changes and deprecations called out (15). Total 75.", "b": "OpenAPI document at api.massive.com/openapi (OpenAPI 3.0.3, 148 paths) with enums such as `timespan` and `sort`, and 400, 401 and 404 responses defined (25). llms.txt at massive.com/docs/rest/llms.txt indexing about 160 endpoint pages (10). One-line descriptions per endpoint in the index, longer ones in the reference, with little on when not to use a call (14 of 20). Typed path and query parameters with enums and required fields (13 of 15). Examples in the docs and error responses in the spec, though the llms.txt says nothing about error shapes (12 of 15). Versioned paths from /v1 to /v3 and a dated public changelog (15)." }, "scores": { "a": 75, "b": 89 } } ], "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Databento, Inc.", "b": "Massive", "name": "Vendor" }, { "a": "https://hist.databento.com", "b": "https://api.massive.com", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP, Streamable HTTP", "name": "Transports" }, { "a": "API key", "b": "API key", "name": "Auth" }, { "a": "Pay per use", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "yes, from $0.01/call", "name": "x402" }, { "a": "Apache-2.0 (clients)", "b": "MIT (clients)", "name": "Licence" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-10-28", "b": "2026-10-28", "name": "Last release" }, { "a": "couldn't be read", "b": "2026-10-06", "name": "Terms last updated" }, { "a": "couldn't be read", "b": "2024-03-22", "name": "Privacy policy last updated" }, { "a": "couldn't be read", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "couldn't be read", "b": "yes", "name": "Terms restrict automated access" }, { "a": "couldn't be read", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "couldn't be read", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "couldn't be read", "b": "yes", "name": "Arbitration or class-action waiver" }, { "a": "309 stars", "b": "1.5k stars", "name": "Popularity" }, { "a": "none", "b": "3.5/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Massive (formerly Polygon.io) scores 73.1 (BB) on agent readiness against Databento's 60.3 (C), and leads in 4 of 7 scored categories. Databento leads on security \u0026 auth.", "question": "Which is better for AI agents, Databento or Massive (formerly Polygon.io)?" }, { "answer": "Both need an API key. An agent can also pay Massive (formerly Polygon.io) per call over x402, with no account.", "question": "Do Databento and Massive (formerly Polygon.io) need an API key?" }, { "answer": "Yes. Databento has a hosted endpoint at https://hist.databento.com and Massive (formerly Polygon.io) at https://api.massive.com.", "question": "Can an agent call Databento and Massive (formerly Polygon.io) without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Security \u0026 auth, 61 against 35" ], "also": null, "goodFor": "An agent that needs exchange-level trades, quotes, order book and bar data for US and European futures, options and equities, or corporate actions and a security master, and can budget per GB.", "slug": "databento", "watchFor": "Two critical and several major incidents on the status page in the 90 days to 3 November 2026, mostly Historical API outages and batch job delays" }, { "aheadOn": [ "Reliability, 78 against 50", "Schema \u0026 documentation, 89 against 75", "Payments \u0026 pricing, 90 against 22", "Transparency \u0026 trust, 67 against 49" ], "also": [ "Agent-ready, a grade of BB or better", "An agent can pay per call over x402, with no account" ], "goodFor": "Agents that need US equities, options or futures data with real history, and the only listing here selling US stock data over x402.", "slug": "massive", "watchFor": "14 partial incidents from 3 August to 1 November 2026, mostly stale or missing data on stock aggregates and quotes" } ], "history": { "databento": null, "massive": [ { "causes": [ "product", "correction" ], "date": "2026-11-01", "delta": 3.2, "from": 69.9, "fromGrade": "B", "to": 73.1, "toGrade": "BB" }, { "causes": [ "method" ], "date": "2026-10-27", "delta": 0.1, "from": 69.8, "fromGrade": "B", "to": 69.9, "toGrade": "B" }, { "causes": [ "method" ], "date": "2026-10-08", "delta": -0.2, "from": 70, "fromGrade": "BB", "to": 69.8, "toGrade": "B" } ] }, "job": { "capability": "market.prices", "name": "Market prices" }, "others": [ { "json": "https://www.anchorterminal.com/compare/alpha-vantage-vs-databento.json", "title": "Alpha Vantage vs Databento", "url": "https://www.anchorterminal.com/compare/alpha-vantage-vs-databento" }, { "json": "https://www.anchorterminal.com/compare/alpha-vantage-vs-massive.json", "title": "Alpha Vantage vs Massive (formerly Polygon.io)", "url": "https://www.anchorterminal.com/compare/alpha-vantage-vs-massive" }, { "json": "https://www.anchorterminal.com/compare/benzinga-vs-databento.json", "title": "Benzinga vs Databento", "url": "https://www.anchorterminal.com/compare/benzinga-vs-databento" }, { "json": "https://www.anchorterminal.com/compare/benzinga-vs-massive.json", "title": "Benzinga vs Massive (formerly Polygon.io)", "url": "https://www.anchorterminal.com/compare/benzinga-vs-massive" }, { "json": "https://www.anchorterminal.com/compare/databento-vs-eodhd.json", "title": "Databento vs EODHD", "url": "https://www.anchorterminal.com/compare/databento-vs-eodhd" }, { "json": "https://www.anchorterminal.com/compare/databento-vs-financial-datasets.json", "title": "Databento vs Financial Datasets", "url": "https://www.anchorterminal.com/compare/databento-vs-financial-datasets" }, { "json": "https://www.anchorterminal.com/compare/databento-vs-financial-modeling-prep.json", "title": "Databento vs Financial Modeling Prep", "url": "https://www.anchorterminal.com/compare/databento-vs-financial-modeling-prep" }, { "json": "https://www.anchorterminal.com/compare/databento-vs-finnhub.json", "title": "Databento vs Finnhub", "url": "https://www.anchorterminal.com/compare/databento-vs-finnhub" }, { "json": "https://www.anchorterminal.com/compare/databento-vs-intrinio.json", "title": "Databento vs Intrinio", "url": "https://www.anchorterminal.com/compare/databento-vs-intrinio" }, { "json": "https://www.anchorterminal.com/compare/databento-vs-tiingo.json", "title": "Databento vs Tiingo", "url": "https://www.anchorterminal.com/compare/databento-vs-tiingo" }, { "json": "https://www.anchorterminal.com/compare/databento-vs-twelve-data.json", "title": "Databento vs Twelve Data", "url": "https://www.anchorterminal.com/compare/databento-vs-twelve-data" }, { "json": "https://www.anchorterminal.com/compare/financial-datasets-vs-massive.json", "title": "Financial Datasets vs Massive (formerly Polygon.io)", "url": "https://www.anchorterminal.com/compare/financial-datasets-vs-massive" }, { "json": "https://www.anchorterminal.com/compare/financial-modeling-prep-vs-massive.json", "title": "Financial Modeling Prep vs Massive (formerly Polygon.io)", "url": "https://www.anchorterminal.com/compare/financial-modeling-prep-vs-massive" }, { "json": "https://www.anchorterminal.com/compare/finnhub-vs-massive.json", "title": "Finnhub vs Massive (formerly Polygon.io)", "url": "https://www.anchorterminal.com/compare/finnhub-vs-massive" }, { "json": "https://www.anchorterminal.com/compare/intrinio-vs-massive.json", "title": "Intrinio vs Massive (formerly Polygon.io)", "url": "https://www.anchorterminal.com/compare/intrinio-vs-massive" }, { "json": "https://www.anchorterminal.com/compare/massive-vs-tiingo.json", "title": "Massive (formerly Polygon.io) vs Tiingo", "url": "https://www.anchorterminal.com/compare/massive-vs-tiingo" }, { "json": "https://www.anchorterminal.com/compare/massive-vs-twelve-data.json", "title": "Massive (formerly Polygon.io) vs Twelve Data", "url": "https://www.anchorterminal.com/compare/massive-vs-twelve-data" }, { "json": "https://www.anchorterminal.com/compare/eodhd-vs-massive.json", "title": "EODHD vs Massive (formerly Polygon.io)", "url": "https://www.anchorterminal.com/compare/eodhd-vs-massive" } ], "panel": null, "scores": [ { "by": 28, "databento": 50, "edge": "massive", "key": "reliability", "massive": 78, "name": "Reliability", "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 14, "databento": 75, "edge": "massive", "key": "schema", "massive": 89, "name": "Schema \u0026 documentation", "weight": 13 }, { "by": 2, "databento": 80, "edge": "databento", "key": "ergonomics", "massive": 78, "name": "Agent ergonomics", "weight": 13 }, { "by": 26, "databento": 61, "edge": "databento", "key": "security", "massive": 35, "name": "Security \u0026 auth", "weight": 14 }, { "by": 68, "databento": 22, "edge": "massive", "key": "payments", "massive": 90, "name": "Payments \u0026 pricing", "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 2, "databento": 84, "edge": "databento", "key": "maintenance", "massive": 82, "name": "Maintenance \u0026 community", "weight": 7 }, { "by": 18, "databento": 49, "edge": "massive", "key": "transparency", "massive": 67, "name": "Transparency \u0026 trust", "weight": 7 } ], "summary": "Massive (formerly Polygon.io) scores 73.1 (BB) on agent readiness against Databento's 60.3 (C), and leads in 4 of 7 scored categories. Databento leads on security \u0026 auth. Both do market prices. Massive (formerly Polygon.io) accepts x402. Databento doesn't.", "tasks": null, "tutorials": [], "verdicts": { "databento": "Exchange-level tick and order book data metered per GB, with published per-IP rate limits, Retry-After on 429, dated release notes and clients in three languages. The HTTP API is still at major version 0, the status page lists two critical and several major incidents in 90 days, there is no OpenAPI document, and the legal pages were unreadable.", "massive": "24 US stock routes over x402 at agent.massive.com, $0.01 each on Base, and only successful requests are charged. The status history lists 14 partial incidents in the 90 days to 1 November, including US equity aggregate bars missing for about 16 hours on 8 and 9 September." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/databento-vs-massive", "json": "https://www.anchorterminal.com/compare/databento-vs-massive.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/databento-vs-massive.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/databento-vs-massive.min.md" }, "markdown": "Massive (formerly Polygon.io) scores 73.1 (BB) on agent readiness against Databento's 60.3 (C), and leads in 4 of 7 scored categories. Databento leads on security \u0026 auth. Both do market prices. Massive (formerly Polygon.io) accepts x402. Databento doesn't.\n\n- Databento: grade C, 60.3/100, rank #578 of 1349. Markdown https://www.anchorterminal.com/tools/databento.md · JSON https://www.anchorterminal.com/api/v1/tools/databento.json\n- Massive (formerly Polygon.io): grade BB, 73.1/100, rank #100 of 1349. Markdown https://www.anchorterminal.com/tools/massive.md · JSON https://www.anchorterminal.com/api/v1/tools/massive.json\n- Best financial market data APIs for AI agents: https://www.anchorterminal.com/best/market-data/index.md\n- All 55 markets comparisons: https://www.anchorterminal.com/compare/market-data/index.md\n\n## Which one, for what\n\n### Databento (C)\n\nGood for: An agent that needs exchange-level trades, quotes, order book and bar data for US and European futures, options and equities, or corporate actions and a security master, and can budget per GB.\n\nAhead on:\n- Security \u0026 auth, 61 against 35\n\nWatch for: Two critical and several major incidents on the status page in the 90 days to 3 November 2026, mostly Historical API outages and batch job delays\n\n### Massive (formerly Polygon.io) (BB)\n\nGood for: Agents that need US equities, options or futures data with real history, and the only listing here selling US stock data over x402.\n\nAhead on:\n- Reliability, 78 against 50\n- Schema \u0026 documentation, 89 against 75\n- Payments \u0026 pricing, 90 against 22\n- Transparency \u0026 trust, 67 against 49\n\nAlso in its favour:\n- Agent-ready, a grade of BB or better\n- An agent can pay per call over x402, with no account\n\nWatch for: 14 partial incidents from 3 August to 1 November 2026, mostly stale or missing data on stock aggregates and quotes\n\n\n## Why the edge\n\n### Payments \u0026 pricing: Massive (formerly Polygon.io) +68\n\n- Databento (22): No x402, MPP or L402 (0). Plans are public ($199, $1,750 and $4,500 a month) and historical data is metered per GB, but the per-dataset rates are in the portal catalogue behind a login and the pricing page's estimator shows only an example (12 of 20). $125 of credits for every new user, expiring after six months; whether a card is needed at signup was not found on the pricing, credits or billing pages (10 of 20). A person signs up in a browser and creates keys in the portal; no key API (0). Total 22.\n- Massive (formerly Polygon.io) (90): x402 on its own domain at agent.massive.com since 1 September, but only 23 US stock routes. Options, indices, forex, crypto, futures, tick data and streaming still need a key (30 of 40). $0.01 a route on Agentic.Market, which the docs link to, and plan prices on massive.com/pricing, all without a login (20). Free Basic plan at 5 calls a minute with end-of-day data. The pricing page doesn't say a card is needed (20). An agent with a funded Base wallet can pay with no account (20).\n\n### Reliability: Massive (formerly Polygon.io) +28\n\n- Databento (50): Graded as a hosted service. Atlassian Statuspage at status.databento.com with ten components, Portal, Historical, FTP and seven live feeds (20). The incident feed for the 90 days to 3 November 2026 lists a critical outage of the portal and Historical API on 6 August lasting about eight hours, critical live authentication timeouts in NY4 on 28 August for about seven hours, major batch job delays of about two days each opened on 6 and 12 October, a six-hour GLBX.MDP3 delay in the Historical API on 6 October, and a Frankfurt outage affecting XEUR and XEEE opened on 2 November and still in monitoring. Several majors (0 of 30). Per-IP limits are published with numbers (15). 429 with a Retry-After header and a code to sleep on it; streams cut off aren't billed for unsent data, batch jobs are billed once (15). No SLA found; the pricing page names none and the terms were unreadable (0). The HTTP API is at major version 0 and the docs say it is not considered stable (0 of 10). Total 50.\n- Massive (formerly Polygon.io) (78): Atlassian Statuspage at massive-status.com with REST, WebSocket and flat-file components for each asset class (20). The history feed lists 14 unplanned incidents from 3 August to 1 November 2026, each limited to one product, one endpoint, one asset class or some accounts. They include US equity aggregate bars missing for roughly two-thirds of US equities from 18:46 ET on 8 September until 10:29 the next day, stale stocks quotes on 20 August, and slow responses with intermittent 502s on stocks v2 aggregates from 10:37 to 13:08 ET on 2 September. The newest, on 27 October, was delayed WebSocket data and REST errors for some accounts from 13:49 to 14:17 EDT. Read the way partial incidents are read on other listings, that is minor incidents only (20). Free plan limited to 5 calls a minute, paid plans unlimited, nothing stated for x402 (10 of 15). No 429 or Retry-After guidance found in the docs or the OpenAPI file, though the official Python client retries 429 with backoff (8 of 15). The business terms dated 6 October 2026 point to a separate Support Policy and SLA document for customers who buy service levels (10). The REST API is generally available (10).\n\n### Security \u0026 auth: Databento +26\n\n- Databento (61): Named API keys, up to 100 per account, rotated or deleted in the portal, with per-member permissions, sent only as the Basic auth username; no scopes per key and no expiry (25 of 30). Every API call is a read, and a monthly historical limit caps what a leaked key can spend; live usage is not capped (14 of 20). The API returns market data and reference records, not free text from third parties (10). A data usage page in the portal and a billing page per cycle, with no per-key call log documented (8 of 15). The vendor revokes keys it finds in public and documents key hygiene; security.txt returns 404 and no bounty, SOC 2 or ISO 27001 was found on readable pages (4 of 20). Total 61.\n- Massive (formerly Polygon.io) (35): A plain account key with no scopes, sent as a Bearer header or as `?apiKey=` in the query string, a documented option (20 less 10, so 10). The x402 route at agent.massive.com needs no key. Read-only market data with no write actions (15 of 20). The x402 set includes news and SEC filing text written by third parties, and we found no guidance on treating it as untrusted (5 of 15). Paid x402 calls leave an on-chain USDC transfer. We found no request log documented for keyed callers (5 of 15). security.txt returns 404, and the terms and privacy policy name no SOC 2, ISO 27001, bug bounty or disclosure policy, only safeguards 'consistent with general industry standards' (0 of 20).\n\n### Transparency \u0026 trust: Massive (formerly Polygon.io) +18\n\n- Databento (49): A closed service whose terms could not be read, because databento.com/legal and its /terms and /privacy pages are drawn by script; the client libraries are Apache-2.0 (10 of 30). The privacy policy was unread for the same reason, and the docs say nothing about retention of account data (0 of 30, unchecked). Dated release notes carry deprecations, and the versioning policy keeps a prior major version for a year after the next (18 of 20). No subprocessor list or data location statement was found on readable pages; the architecture docs name the company's own data centres (0 of 20). Total 28.\n- Massive (formerly Polygon.io) (67): Closed service under business terms last updated 6 October 2026, Massive.com, Inc. under Georgia law, which now also cover pay-per-request purchases without an account. The MCP server and clients are MIT (15). Privacy policy last updated 22 March 2024, with retention 'as long as we are providing the Services' and no periods. The business terms require deleting data on termination. No DPA found (12 of 30). Dated sunsets in the changelog. The terms let Massive change the Services at its discretion, with a 30-day route to report a change that materially degrades a subscribed service (10 of 20). Stripe, Google and Hotjar are named, and data may sit 'in the United States and locations around the world'. No subprocessor list (8 of 20).\n\n### Schema \u0026 documentation: Massive (formerly Polygon.io) +14\n\n- Databento (75): No OpenAPI document was found. The contract is the per-endpoint reference with typed parameters, the DBN schemas with field tables and enums, and a .http.md variant of every page (8 of 25). llms.txt and a Markdown twin of every page with language variants (10). Endpoint pages say what each call returns and the basics pages say when to use streaming against batch (15 of 20). Typed parameters with enums for schema, encoding, symbology type and split duration (13 of 15). Code in Python, C++, Rust and curl on every page, and an error table with codes, named error identifiers and a docs link in each body (14 of 15). Semantic versioning with dated release notes per component, breaking changes and deprecations called out (15). Total 75.\n- Massive (formerly Polygon.io) (89): OpenAPI document at api.massive.com/openapi (OpenAPI 3.0.3, 148 paths) with enums such as `timespan` and `sort`, and 400, 401 and 404 responses defined (25). llms.txt at massive.com/docs/rest/llms.txt indexing about 160 endpoint pages (10). One-line descriptions per endpoint in the index, longer ones in the reference, with little on when not to use a call (14 of 20). Typed path and query parameters with enums and required fields (13 of 15). Examples in the docs and error responses in the spec, though the llms.txt says nothing about error shapes (12 of 15). Versioned paths from /v1 to /v3 and a dated public changelog (15).\n\n## Score by category\n\n| Category | Weight | Databento | Massive (formerly Polygon.io) | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 50 | 78 | Massive (formerly Polygon.io) +28 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 75 | 89 | Massive (formerly Polygon.io) +14 |\n| Agent ergonomics | 13% (16.2 this run) | 80 | 78 | Databento +2 |\n| Security \u0026 auth | 14% (17.5 this run) | 61 | 35 | Databento +26 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 22 | 90 | Massive (formerly Polygon.io) +68 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 84 | 82 | Databento +2 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 49 | 67 | Massive (formerly Polygon.io) +18 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **60.3 · C** | **73.1 · BB** | |\n\n## Facts side by side\n\n| Fact | Databento | Massive (formerly Polygon.io) |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Databento, Inc. | Massive |\n| Hosted endpoint | `https://hist.databento.com` | `https://api.massive.com` |\n| Transports | HTTP | HTTP, Streamable HTTP |\n| Auth | API key | API key |\n| Pricing | Pay per use | Freemium |\n| x402 | no | yes, from $0.01/call |\n| Licence | Apache-2.0 (clients) | MIT (clients) |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-10-28 | 2026-10-28 |\n| Terms last updated | couldn't be read | 2026-10-06 |\n| Privacy policy last updated | couldn't be read | 2024-03-22 |\n| Customer content may train models | couldn't be read | not found in the text |\n| Terms restrict automated access | couldn't be read | yes |\n| Terms restrict benchmarking | couldn't be read | yes |\n| Terms or service can change without notice | couldn't be read | not found in the text |\n| Arbitration or class-action waiver | couldn't be read | yes |\n| Popularity | 309 stars | 1.5k stars |\n| Agent reviews | none | 3.5/5 (2) |\n\n## How the scores have moved\n\n### Databento\n\nNo score change since it was listed.\n\n### Massive (formerly Polygon.io)\n\n- +3.2 on 1 November 2026 (B to BB): product, correction\n- +0.1 on 27 October 2026: checklist\n- -0.2 on 8 October 2026 (BB to B): checklist\n\n## Verdicts\n\n**Databento.** Exchange-level tick and order book data metered per GB, with published per-IP rate limits, Retry-After on 429, dated release notes and clients in three languages. The HTTP API is still at major version 0, the status page lists two critical and several major incidents in 90 days, there is no OpenAPI document, and the legal pages were unreadable.\n\n**Massive (formerly Polygon.io).** 24 US stock routes over x402 at agent.massive.com, $0.01 each on Base, and only successful requests are charged. The status history lists 14 partial incidents in the 90 days to 1 November, including US equity aggregate bars missing for about 16 hours on 8 and 9 September.\n\n## Before you call either\n\n### Databento\n\n1. Call `metadata.get_cost` before `timeseries.get_range`, and set a monthly historical limit in the portal; a duplicate streaming request is charged twice\n2. Send the key as the Basic auth username (`-u $DATABENTO_API_KEY:`) to hist.databento.com/v0; never put it in the URL or source code\n3. On 429 wait for the Retry-After header; keep under 100 time series requests a second and 20 batch submissions a minute per IP\n4. Check status.databento.com before retrying a slow or 504 Historical request, since several incidents since August were API outages or batch delays\n5. Use batch download for requests over 5 GB, split by time range or `limit`, and read `schema` and `stype_in` from the dataset page before querying\n\n### Massive (formerly Polygon.io)\n\n1. Send the key as a Bearer header, not `?apiKey=`, so it stays out of logs\n2. Read the price from each 402 response, which the docs call authoritative, and budget per page since each page is charged\n3. Use agent.massive.com only for US stocks. Options, crypto, forex and futures need a keyed plan\n4. Check `massive-status.com` when aggregates look stale, since several incidents since August were bars that stopped updating or went missing\n5. Don't republish prices fetched on an individual plan\n\n## Questions\n\n### Which is better for AI agents, Databento or Massive (formerly Polygon.io)?\n\nMassive (formerly Polygon.io) scores 73.1 (BB) on agent readiness against Databento's 60.3 (C), and leads in 4 of 7 scored categories. Databento leads on security \u0026 auth.\n\n### Do Databento and Massive (formerly Polygon.io) need an API key?\n\nBoth need an API key. An agent can also pay Massive (formerly Polygon.io) per call over x402, with no account.\n\n### Can an agent call Databento and Massive (formerly Polygon.io) without installing anything?\n\nYes. Databento has a hosted endpoint at https://hist.databento.com and Massive (formerly Polygon.io) at https://api.massive.com.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/databento-vs-massive.json, and with the fewest tokens: https://www.anchorterminal.com/compare/databento-vs-massive.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"databento\", \"b\": \"massive\"}`. From a terminal: `anchor compare databento massive`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/databento.json and https://www.anchorterminal.com/api/v1/tools/massive.json\n\n## Other comparisons with Databento or Massive (formerly Polygon.io)\n\n- [Alpha Vantage vs Databento](https://www.anchorterminal.com/compare/alpha-vantage-vs-databento.md)\n- [Alpha Vantage vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/alpha-vantage-vs-massive.md)\n- [Benzinga vs Databento](https://www.anchorterminal.com/compare/benzinga-vs-databento.md)\n- [Benzinga vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/benzinga-vs-massive.md)\n- [Databento vs EODHD](https://www.anchorterminal.com/compare/databento-vs-eodhd.md)\n- [Databento vs Financial Datasets](https://www.anchorterminal.com/compare/databento-vs-financial-datasets.md)\n- [Databento vs Financial Modeling Prep](https://www.anchorterminal.com/compare/databento-vs-financial-modeling-prep.md)\n- [Databento vs Finnhub](https://www.anchorterminal.com/compare/databento-vs-finnhub.md)\n- [Databento vs Intrinio](https://www.anchorterminal.com/compare/databento-vs-intrinio.md)\n- [Databento vs Tiingo](https://www.anchorterminal.com/compare/databento-vs-tiingo.md)\n- [Databento vs Twelve Data](https://www.anchorterminal.com/compare/databento-vs-twelve-data.md)\n- [Financial Datasets vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/financial-datasets-vs-massive.md)\n- [Financial Modeling Prep vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/financial-modeling-prep-vs-massive.md)\n- [Finnhub vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/finnhub-vs-massive.md)\n- [Intrinio vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/intrinio-vs-massive.md)\n- [Massive (formerly Polygon.io) vs Tiingo](https://www.anchorterminal.com/compare/massive-vs-tiingo.md)\n- [Massive (formerly Polygon.io) vs Twelve Data](https://www.anchorterminal.com/compare/massive-vs-twelve-data.md)\n- [EODHD vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/eodhd-vs-massive.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "attributionRequired": true, "credit": "CC BY 4.0, credit Anchor Terminal and link the page or API address you took it from (https://www.anchorterminal.com/terms/#data)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-11-04", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.7", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run", "terms": "https://www.anchorterminal.com/terms/#data" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Databento vs Massive (formerly Polygon.io)", "url": "" } ], "description": "Massive scores 73.1 (BB) to Databento's 60.3 (C) for market prices. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Databento C 60.3", "Massive (formerly Polygon.io) BB 73.1", "scores" ], "h1": "Databento vs Massive (formerly Polygon.io)", "image": "https://www.anchorterminal.com/assets/og/default.png", "path": "/compare/databento-vs-massive", "published": "2026-10-01", "section": "tools", "title": "Databento vs Massive for AI agents in 2026: scores and prices", "toc": null, "updated": "2026-11-03", "url": "https://www.anchorterminal.com/compare/databento-vs-massive" }, "tokens": { "markdown": 4450, "slim": 2680 }, "version": 1 }